[patch] expmed.c: Fix PR 23971 - slow synth_mult.

[Falk Hueffner]

Kazu Hirata <kazu@codesourcery.com> writes:

> Here is the timing in seconds with the cross compiler to
> alpha-linux-gnu from x86_64-pc-linux-gnu.
>
> original patched diff(%)
>    6.939   0.686 -90.114 (wow!)

Actually, 0.6 seconds for one line of source still seems quite
excessive... While this patch certainly seems like a good idea, I'm
wondering whether we shouldn't just additionally put an upper limit to
the number of instructions generated, since it seems unlikely that
expanding a multiply to more than say 12 insns is really such a great
idea.

-- 
	Falk